Lifting-jack



A.- NEAL. LIFTING JACK. APPLICATION FILED 0 01'. 2, I9I 8.

1,355,842. Patented Oct 19,1920.

YII'IIIIIIIIIIIIIIII/l ll llul Q I uvrz/vro '2 A TTOP/VIY- OFFICE.

ALBERT NEAL, OF KOKOMO, INDIANA.

LIFTING-JACK.

Application filed October 2, 1918.

To 015 whom it may concern:

it known that I, ALBERT NEAL, a citi- Zen .of the United States,residing at Ko-' komo,,in the county of Howard and State of Indiana,have invented certain new and useful Improvements in Lifting-Jacks, ofwhich the following is a specification.

A demand has arisen for a lifting-jack by which a wheel of a motor carcaneasily be raised a distance so that the face at the tire will clearthe ground, and by which the load can be instantly dropped by reason ofthe cushioning eifect afi'orded by the pneumatic character of the tire,so that fit the tedious operation of gradually letting the car dOWn isobviated.

The present invention relates to the above class of lifting-jacks, andone of the objects of the invention consists in the provisiofi of alifting jack of the above character by which a motor car, or similarload, can be easily and quickly raised the desired height and at theconclusion of making repairs, such, for instance, as changing a tire,the load can instantly be dropped, thereby effleeting a considerablesaving of time than by the use of a jack whereby the load must belowered through successive steps.

A further object of the invention consists in the provision of a1ifting-jack of the above character in which the lifting-bar holds allof the acting parts against accidental displacement, together with asingle means for preventing accidental displace ment of saidlifting-bar.

A still further object of the invention consists in the provision of alifting-jack of the above'character which is simple in constrLu-tion,ellicient in operation, and cheap to manufacture. Y

l accomplish the above objects of the invention, and such others as mayappear from a perusal of the specification and claims, by means of theconstruction illus-l tratcd in the accompanying drawing forming a parthereof", in which- Figure 1 is a central vertical sectional view of thelifting-jack housing, showing the movable parts in elevation. Fig. 2 isa view similar to Fig. 1, exceptthat the movable parts of the jack areshown as occupying a changed position. Fig. 3 is a sectional View on theline 3-3 in Fig. 1. Fig. 4 is a fragmentary detail front elevation ofthe 1 lifting jack housing. Fig. 5 is a cross sec- Specification ofLetters Patent.

vided with trunnions 2]. which Serial No. 256,496.

' tional view of the lifting-bar, on the line 5-5 in Fig. 1. Fig. 6 is afront on an enlarged scale, of the upper end of the inner pawl andswinging cam-arm.

Referring to the drawings, 10 represents elevation,

the liftingbar of the device, and this bar is provided 1n one edge witha series of teeth 11, and the opposite edge of the bar 18 cut away so asto form a pair of longi tudinal parallelreeesses 12, which are separatedby. a rib 13, and recesses 12 are closed at theirlower ends by means ofthe shoulder15,-the object of the shoulder being hereinafter described.Lifting-bar 10 has vertical movement through a passageway 16 in housing17 of the jack, and passageway 16 is formed by the side walls of housing17, outer wall 18, and inner wall 19. Lifting-bar 10 is moved verticallyby means of a lever 20, and this lever is pro are introduced intohousing 17 through internal passageways 22, the latter terminating inlaterally disposed \recesses 23 (Fig. 1) the closed ends of which areadapted to re .ceive and form bearing points adapted to receive thetrunmons21 Patented Scene, 1920.

ator pawls 27 and 28, and these pawls are 'aralnged relatively to theaxis of trunnions 21 so that when lever 20 is oscillated said pawls willalternately be moved upwardly and downwardly and thereby intermittentlymove lifting-bar 1O upwardly. Pawls 27 and 28 are pivotally connectedwith lever 20 by means of the cylindrical bosses 30 (Fig. 3) which entersuitable apertures in a rib 31 formed along one of the side edges-ofsaid lever. "With the heretofore described construction and arrangementof parts, as lever 20 is moved. upwardly into theposition indicated bythe dotted line in Fig. 1, pawl 27 moves downwardly so as to engage thesuccedding tooth in lifting-bar 10 while, at the same time, pawl 28 isengaged with one of the teeth 11 and is m vi g bar 10 upwardly.

On the downward stroke of lever 20 pawl 28 iswliscngaged from teeth 11and moves ('lfimlll'lldly while pawl 27 is engaged with: one of theteeth 11 and is moving bar 10 upwzfidly. Pawls 27 and 28 are movedalternately into and out of engagement with teeth 11 on lifting-bar 10through the instrumentality of a fixed cam 35 carried by pawl 28 and aswinging-cam 36 pivotally connected to and moving with pawl 27 The ovalshaped character of the opposing faces of cams 35 and 36 controls thealternateengagement and disengagement of the .free end of pawls 27 and28 in the following manner. When lever 20 is elevated, the mounting ofpawl 28 relatively to the axis of trunnions 21 causes said pawl to moveupwardly and tance of one of the teeth 11, and during this movement ofpawl 28 the integral cam 35 is carried upwardly a correspondingdistance. During this upward travel of pawl 28, swinging-cam 36 movesdownwardly with pawl 27 and rides over the oval face of cam and pullsswinging-cam 36 in a direction to cause pawl 27 to be disengaged. Whenpawl 27 nears the end of its downward travel it is free to move intoengagement with teeth 11 'by means-of the additional clearance affordedby the rounding off character of the opposing faces of earns 35 and 36.On the downward stroke of 1GVGI'A2O pawl 27 is carrying the load andmoves upwardly carrying bar 10 with it, while the pivotal mounting ofswingingcam 36 is free to ride over the oval face of cam 35 withoutaffecting the movement of or disengaging pawl 27 from teeth 11. Duringthis latter operation of lever 20 pawl 28'moves downwardly free of teeth11. The range of oscillation of lever 20 in raising lifting-bar 10upwardly in successive steps so that the movable parts of the jack willfunction properly is regulated by means of a notch 40 cut into the innerwall of housing 17, as clearly shown in Fig. 4. The free end of lever 20ishollow to receive an operating handle 41 so that the desiredleveragecan be secured and whereby handle 41 can be removed to enable the jackto be placed within the length of an ordinary tool-box, such as forms apart of the equipment of all motor cars. The inner end of handle 41is.,.widened, as at 42, (see Fig. 3) and between the widened portion 42and the major portion of the handle 41 where it rests within the hollowportion of lever 20 it is formed wedge-shaped. This construction affordsthe necessary clearance to permit handle 41 to be moved and shift thewidened'portion 42 laterally a sufiicient distance to cause the edge ofportion 42 to project beyond the edge of lever20-and into notch 40,thereby confining the throw of lever 20 within the length of said notch.

The inner end of handle 41 is properlylocated within the hollow portionof lever-20 so as to hold the widened portion 42 within notch 40 bymeans of an integral lug 44 formed. on the underside of portion 42 andthis lug is shifted laterally from one side to widened portion with itlifting-bar 10 the dis 7 "on the opposite side of positioning lug oflever 20 when handle 41 is oscillated.

When lug 44 is placed on one side of the positioning lug '45 the sideedge of the 42 projects beyond the limits of lever 20 and moves withinnotch 40 in housing 17. When it is desired to drop the load, handle 41is moved longitudinally a sufficient distance to move lug 44 clear ofpositioning lug 45, and after shifting lever 41 laterally to bring lug44 45, handle 41 is again moved inwardly. In this last mentionedposition the widened portion 42 will project beyond the opposite Side oflever 20 and into a notch 47 (Fig. 4) which affords a longer throw ofthe handle 41, and as the latter is moved upwardly an abnormal distancepawl 27 will be lowered an abnormal distance and bring the hook on itsfree end into engagement with inclined face 49 on inner wall 19 cansingsaid pawl to be disengaged f'rom'teeth 11. As pawl 2.7 moves backward indisengaging from teeth 11, under the influence of inclined'face 49 theouter face of said pawl contacts and'disengages pawl 28 from teeth 11,thereby allowing lifting-bar. 10 to freely drop.

It will be noted in examining Fig. 1 that lifting-bar 10 may extendbelow housing 17 to' enable a load to be lifted a greater distance thanwould otherwise be possible if said bar was nested wholly within thehousing 17'. In this case an auxiliary block is employed to form a basefor-the housing 17.

By means of the hereinbefore described construction and arrangement ofparts, lever 20 and its connected pawls 27 and 28 are held, againstaccidental displacement while lifting-bar 10 is in its proper-operativeposition, and the latter is limited in its travel and against accidentaldisplacement by means of the fianged-head 50 and a set screw 51 whichprojects into one of the longitudinal recesses 12 and contacts shoulder15 formed on the lower end of liftingbar 10.

Having thus fully described my said invention, what I desire to secureby Letters Patent, is--. I v

1. A lifting jack comprising ahousing having a passageway therethrough,a toothed lifting-bar through said passageway, an oscillating leverarranged in said housing, an inner and an outer pawl arranged topivotally connect with the lever onthe opposite sides of its pivot andalternately engaging the having moyement the adjacent face of cam 35toothed bar by the rocking of the lever,

when the lattermoves downwardly of said lifting-bar. h

2. A lifting jack comprising a housing having a pair of internal notchesof different lengths, a toothed lifting-bar having movement throughsaid-housing, an oscillating lever arranged in said housing, an innerand an outer pawl arranged to its pivot and alternately engaging thetoothedbar by the rocking of said lever, a handle arranged in said leverand "susceptible of being shifted laterally to cause the inner end ofthe handle to project outside the lever and into the short notch in thehousing for limiting the throw of the pawl to the distance the teeth inthe lifting bar are spaced apart.

3. A lifting jack comprising a housing having a pair ofinternal notchesof different lengths a toothed lifting-bar having move mentthrough'said' housing, an oscillating leverarranged in said houslng, aninner and pivotally connect with the lever on opposite sides of an outerpawl pivotally connected to said lever on opposite sides of its pivotfor alternately moving said pawls into engagement with said lifting-barwhen the lever'is'oscillated, a laterally movable handle arranged insaid lever for shifting the inner end of the handle into the short orlong notch and thereby limit the throw of the lever to movethe pawls thedistancethe teeth in the lifting-bar are spaced apart or formoving thepawls an abnormal distance for contacting a stationary cam and effectthe disengagement of, the pawls from the teeth in the'bar, and astationary cam arranged in the housing for contactingand effecting thedisengagement of the free end of the inner pawl from the toothlifting-bar when the lever is depressed an abnormal distance.

In witness whereof I ,have hereunto set my hand and seal at Indiana this28th day of September, D. one thousand nine hundred and ei hteen..

' ALBERT [n s.]

olis, Indiana,

